Like a ship

Completed all chapters on Normal difficulty or higher

Acquired a total of over 100,000 relics

Defeated the Chapter 7-5 boss

Acquired a Crystal Relic

Defeated 100 robots

Attack an ally unit with an area-of-effect attack.

Discovered a treasure chest

Exo Melee kill 10 zombies in 30 seconds in Outbreak.

Why don't you try finishing up the tutorial? You might've mastered the first step, but nailing down the fundamentals is what's important.

Attack and destroy a monster.

Throw diamonds at another player.